feat: configured nest config module

Author: coderdiaz

src/app.module.ts

@@ -1,6 +1,10 @@
 import { Module } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import config from './config';
 
 @Module({
-  imports: [],
+  imports: [
+    ConfigModule.forRoot({ isGlobal: true, load: [config] }),
+  ],
 })
 export class AppModule {}

src/config.ts

@@ -0,0 +1,8 @@
+export type Config = {
+  port?: number;
+}
+
+// Define environment variables
+export default () => ({
+  port: process.env.PORT || 3000,
+} as Config);

src/main.ts

@@ -1,3 +1,4 @@
+import { ConfigService } from '@nestjs/config';
 import { NestFactory } from '@nestjs/core';
 import {
   FastifyAdapter,
@@ -11,7 +12,11 @@ async function bootstrap() {
     new FastifyAdapter(),
   );
 
-  await app.listen(3000, '0.0.0.0');
+  // Getting configuration from environment
+  const configService = app.get(ConfigService);
+  const port = configService.get('port');
+
+  await app.listen(port, '0.0.0.0');
 }
 
 bootstrap();